Hi Vlad / Niel, Please disregard this issue. I extracted sctp from kernel linux-3.2.34 and it does not seem to be a problem. Looks like the sctp I have in 3.2.32 is the problem. Once again, I very sorry to engage you in this. Thanking you in advance for all your time and effort. -DilipD. On Thu, 2012-11-29 at 16:33 -0500, Dilip Daya wrote: > Hi Vlad, > > On Thu, 2012-11-29 at 15:49 -0500, Vlad Yasevich wrote: > > On 11/29/2012 03:35 PM, Dilip Daya wrote: > > > Hi, > > > > > > Testing kernel 3.2.32 x86_64 environment show the sctp sysctl variables: > > > > > > - net.sctp.rto_initial, > > > - net.sctp.rto_min, > > > - net.sctp.rto_max > > > > > > are not overriding the hard-coded recommended values of: > > > - http://lxr.linux.no/linux+v3.2.34/include/net/sctp/constants.h#L276 > > > > > > I've confirmed the following values are correct to what I need modified: > > > - /proc/sys/net/sctp/rto_initial > > > - /proc/sys/net/sctp/rto_min > > > - /proc/sys/net/sctp/rto_max > > > > > > If I change the hard-coded values and rebuild sctp they take effect. Is > > > this an issue on my end or is this a sctp sysctl issue? > > > > > > Thanks, > > > -DilipD. > > > > > > > Dilip > > > > I am not sure what you mean... Are you saying that issuing > > sysctl -w net.sctp.rto_initial=100 > > doesn't change the value of rto_initial shown in /proc/sys/net/sctp? > > No, it does change the value in /proc/sys/net/sctp but not picked up by > sctp associations. Only default recommended values are picked up, i.e. > > # sysctl -a 2>/dev/null | grep ".rto_" > net.ipv4.tcp_frto_response = 0 > net.sctp.rto_initial = 25 > net.sctp.rto_min = 20 > net.sctp.rto_max = 30 > net.sctp.rto_alpha_exp_divisor = 3 > net.sctp.rto_beta_exp_divisor = 2 > > # cat /proc/sys/net/sctp/rto_max > 30 > > # cat /proc/sys/net/sctp/rto_min > 20 > > # cat /proc/sys/net/sctp/rto_initial > 25 > > Selective sctp debug: > [ 206.783286] sctp_init_sock: net_params->rto_min: 1000, > net_params->rto_initial: 3000, net_params->rto_max: 60000 > [ 206.783291] sctp_init_sock: sp->rtoinfo.srto_min: 1000, > sp->rtoinfo.srto_initial: 3000, sp->rtoinfo.srto_max: 60000 > [ 206.783403] sctp_association_init: sp->rtoinfo.srto_min: 1000, > sp->rtoinfo.srto_initial: 3000, sp->rtoinfo.srto_max: 60000 > [ 206.783407] sctp_association_init: asoc->rto_min: 250, > asoc->rto_initial: 750, asoc->rto_max: 15000 > [ 206.783426] sctp_transport_init: net_params->rto_initial: 3000, > peer->rto: 750 > [ 206.783993] sctp_transport_init: net_params->rto_initial: 3000, > peer->rto: 750 > [ 206.784008] sctp_transport_init: net_params->rto_initial: 3000, > peer->rto: 750 > [ 206.784019] sctp_transport_init: net_params->rto_initial: 3000, > peer->rto: 750 > [ 206.784028] sctp_transport_init: net_params->rto_initial: 3000, > peer->rto: 750 > [ 206.784038] sctp_transport_init: net_params->rto_initial: 3000, > peer->rto: 750 > [ 206.784047] sctp_transport_init: net_params->rto_initial: 3000, > peer->rto: 750 > [ 206.784731] sctp_transport_update_rto: transport: ffff88011e1b0400, > rtt: 0, srtt: 0 rttvar: 1, rto: 250, rto-msecs: 1000, rto_min: 250, > rto_max: 15000 > ... > > # cat /proc/net/sctp/remaddr > ADDR ASSOC_ID HB_ACT RTO MAX_PATH_RTX REM_ADDR_RTX START > 192.168.2.62 1 1 250 5 0 0 > > # cat /proc/net/sctp/assocs_info | grep "R:" > R:192.168.2.62 1 1500 0 5 11832 0 21040 250 0 1 0 > > i.e. > > Default hard-coded recommended values are: > rto_min = 1000 msec = 1000/4 = 250 jiffies > rto_initial = 3000 msec = 3000/4 = 750 jiffies > rto_max = 60000 msec = 60000/4 = 15000 jiffies > > > => Seems sctp sysctl rto_ variables do not effect. > > -DilipD. > > > > > -vlad > > > > > -- > > > To unsubscribe from this list: send the line "unsubscribe linux-sctp" in > > > the body of a message to majordomo@xxxxxxxxxxxxxxx > > > More majordomo info at http://vger.kernel.org/majordomo-info.html > > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-sctp" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
